Itchy feet are caused by fungal infections and skin conditions, notes FootVitals. Athlete’s foot is a fungal infection that can be spread from person to person or picked up by walking on contaminated floors, says MedicineNet. Skin conditions that cause itchy feet include dermatitis, eczema and psoriasis. Itchy feet may also occur due to allergies, sweaty feet, hives, hookworm and poor hygiene.